Y Cefnfor Tawel

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(Ailgyfeiriad oddi wrth Cefnfor Tawel)
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Cefnforoedd y Ddaear
(Cefnfor y Byd)
Y blwch hwn: gweld  sgwrs  golygu
Y Cefnfor Tawel
Pacific Ocean-ES.png
Math Cefnfor Edit this on Wikidata
Daearyddiaeth
Rhan o'r canlynol Cefnfor y Byd Edit this on Wikidata
Arwynebedd 161,760,000 km² Edit this on Wikidata
Cyfesurynnau 0.000000°N 160°W Edit this on Wikidata
Llednentydd Afon Patía, Afon San Juan, Afon Biobío, Afon Shimanto, Afon Tone, Afon Moche, San Francisco Bay, Afon Klinaklini, Afon Nass, Afon Kitimat, Afon Homathko, Afon Chilkat, Afon Diahot, Afon Santa Ynez, Afon Aan, Afon Abukuma, Afon Pisco, Afon Imperial, Afon Siletz, Afon Alsea, Afon Tijuana, Afon Kushiro, Afon Los Angeles, Afon Aniakchak, Dumbéa, Afon Sagami, Afon Clutha, Afon Beinan, Afon Hualien, Afon Zhuoshui, Afon Lanyang, Afon Xiuguluan, Sungai Mamberamo, Afon Lluta, Afon Loa, Afon Copiapó, Afon Huasco, Afon Elqui, Afon Limarí, Afon Aconcagua, Afon Maipo, Afon Ameca, Afon Wailua, Afon Güiza, Afon Clarence, Río Virú, Afon Naka, Afon Balsas, Afon Oirase, Afon D, Afon Hoh, Afon Klamath, Afon Yoshino, Afon Rapel, Afon Ōi, Afon Umpqua, Rímac, Afon Kitakami, Afon Ayampe, Quinault River, Afon Toltén, Afon Maule, Afon Sigatoka, Afon Lempa, Afon Waimakariri, Afon Kaukonahua, Afon Rewa, Afon Turanganui, Afon Siuslaw, Afon Santa Ana, Afon Waiapu, Afon Acomé, Afon Achiguate, Afon Mataquito, Afon Rogue, Afon Suchiate, Afon Nehalem, Quebrada de Azapa, Afon Camarones, Afon Russian, Afon Waitaki, Afon Owaka, Afon Stikine, Afon Pistol, Afon Goascorán, Afon Santa, Afon Quillayute, Afon Rakaia, Afon Choapa, Afon Chira, Afon Choluteca, Afon Salmon, Afon San Gabriel, Afon San Luis Rey, Afon Esmeraldas, Río Grande de Santiago, Afon Taieri, Afon Tehuantepec, Afon Guáitara, Afon Stillaguamish, Afon Taku, Te Oka Stream, Afon Smith, Afon Wailuku, Afon Tukituki, Afon Akitio, Aliso Creek, Afon Waiau, Tonda, Waikōloa Stream, Afon Chillón, Afon Chone, Afon Chetco, Afon Coquille, Afon Eel, Afon Paz, Afon Hiki, Río Chancay, Afon Tumbes, Afon Maullín, Afon Omaru, Ouaieme, Afon Ozette, Afon Queets, Redwood Creek, Afon Porangahau, Rivière des Lacs, Afon Anchicayá, Afon Baudó, Afon Palena, Q3458584, Q3458609, Afon Mataje, Afon Mira, Naya River, Afon Puelo, Q3458767, Afon San Juan de Micay, Afon Sinaloa, Afon Yurumanguí, Afon Tokachi, Afon Umiray, Afon Acaponeta, Afon Itata, Afon Akan, Q3648677, Q3648685, Q3648690, Q3648717, Afon Saru, Afon Lurín, Río Camaná, Afon Ugum, Afon Albion, Q4084568, Q4091161, Bol'shaya Sarannaya, Bol'shaya Khodutka, Bol'shoy Vilyuy, Q4105362, Q4109610, Galinka, Golubichnaya, Q4180565, Q4186327, Belyayeva, Inkanyush, Q4210882, Q4230873, Q4243663, Q4246834, Q4263336, Q4266878, Q4277306, Q4277465, Q4286451, Mutnaya, Nalychëva, Afon Nestucca, Afon Noyo, Ostrovnaya, Q4349994, Afon Waipara, Salado River, Q4408420, Q4412647, Afon Fukuji, Q4523340, Q4527802, Q4462891, Q4466681, Q4479032, Fal'shivaya, Afon Hanalei, Afon Ashburton, Afon Avana, Afon Awhea, Afon Bear, Afon Fawr, Afon Big Sur, Afon Blythe, Afon Bueno, Butano Creek, Afon Caplina, Afon Carmel, Afon Casma, Afon Cañas, Afon Coalcomán, Afon Colca, Afon Comalapa, Afon Conway, Afon Coyolate, Afon Dagua, Afon Ebi, Afon La Ligua, Afon Flaxbourne, Afon Ocosito, Afon Garcia, Afon Gualala, Afon Los Esclavos, Afon Hapuku, Afon Ocoña, Afon Ica, Q5769350, Afon María Linda, Afon Ichinomiya, Afon Icán, Afon Isumi, Río Bravo, Afon Carampangue, Río Cuale, Río Locumba, Río San Pedro Mezquital, Afon Jiboa, Kaikorai Stream, Afon Kekerengu, Afon Kowhai, Afon Kuriyama, Afon Kurobe, Afon Lacramarca, Laguna Creek, Afon Lingue, Afon Little, Afon Little Sur, Afon Madre Vieja, Afon Makikihi, Afon Mangakuri, Afon Mataikona, Afon Mattole, McWay Creek, Afon Mitsuishi, Afon Mu, Afon Naranjo, Afon Jequetepeque, Afon Navarro, Afon Niikappu, Afon Orari, Afon Orutua, Afon Otaio, Afon Owahanga, Afon Pahaoa, Afon Pakarae, Afon Pakiri, Afon Papenoo, Afon Pareora, Pescadero Creek, Afon Pirris, Pomponio Creek, Afon Portoviejo, Afon Pouawa, Redwood Creek, Afon Rerewhakaaitu, Afon Reñihué, Salmon Creek, Afon Salt, Afon Samalá, San Antonio Creek, Afon San Dieguito, San Gregorio Creek, Afon San Lorenzo, San Pedro Creek, Afon Santa Maria, Afon Savegre, Afon Shizunai, Afon Shuang, Afon Sierpe, Afon Siltcoos, Afon Sixes, Afon Sooes, Afon Tahakopa, Afon Ten Mile, Tenmile Creek, Afon Tohoratea, Afon Térraba, Usal Creek, Afon Ventura, Rio Cañete, Afon Waatch, Waddell Creek, Afon Waikawa, Afon Waimangarara, Afon Waimea, Afon Wainui, Afon Waiomoko, Afon Waipati, Afon Whakataki, Afon Whareama, Afon Yachats, Afon Nahualate, Afon Huarmey, Afon Yamato, Río Chamán, Chicama River, Río Mala, Afon Osmore, Afon Jubones, Afon Ukuru, Q11339385, Q11368198, Afon Kuji, Q11385396, Motoura River, Q11396630, Afon Kamo, Afon Yūfutsu, Q11408284, Afon Atsuma, Q11429902, Afon Ōkita, Q11449238, Afon Abira, Afon Miyata, Q11481777, Q11481943, Q11486240, Q11499713, Q11503717, Afon Hidaka, Q11510817, Q11518415, Q11518417, Q11523761, Q11528354, Q11541557, Q11546901, Q11558251, Q11559324, Q11570265, Q11572149, Q11579113, Q11580319, Q11587447, Liwu River, Afon Iburi-Horobetsu, Afon Shitakara, Q11616819, Afon Charo, Q11645736, Afon Mabechi, Afon Takase (Aomori), Q11674195, Q11676220, Afon Course of the Rogue (Oregon), Rio Parrita, Q13191194, Cristianitos Creek, Devil Canyon Creek, Afon Little, Tenaja Canyon Creek, Afon New, Afon Hoko, Afon Moclips, Afon Oaro, Q15924958, Q16488389, Lapataia River, Afon Contaco, Afon Huellelhue, Afon Llico, Afon Llesquehue, Afon Necanicum, Q14915320, Afon Hurunui, Afon Kamuiwakka, Afon Nicodahue, Q17191451, Q17217535, Q17221511, Afon Atitara, Afon Raft, Honolii Stream, Q18338647, Afon Yahtse, Kiltuish River, Koeye River, Brittain River, Q24860718, Afon Vaitepiha, Río Verde, Q28966576, Big Salmon Creek, Afon Waimea, Depoe Bay, Afon Columbia, Afon Tenryū, Afon Gaoping, Y Cefnfor Tawel Edit this on Wikidata

Y cefnfor mwyaf yn y byd yw'r Cefnfor Tawel (Saesneg: Pacific Ocean), sy'n gorwedd rhwng Asia yn y gorllewin a De a Gogledd America yn y dwyrain. Ceir ynysoedd niferus yn y cefnfor hwn sydd yn cael eu dosbarthu fel Melanesia, Polynesia a Micronesia, dosbarthiad diwyllianol yn hytrach na dosbarthiad daearyddol. Ymysg y moroedd sydd yn perthyn i'r Cefnfor Tawel y mae Môr Bering, Môr Okhotsk, Môr Japan, Y Môr Melyn, Môr Dwyreiniol Tsieina, Môr De Tsieina, Môr Bismarck, Môr Solomon, Y Môr Cwrel a Môr Tasman.

Mae llawer o wledydd ar arfordir y cefnfor hwn: Rwsia, Japan, Taiwan, Y Philipinau, Indonesia, Papua Gini Newydd, Awstralia, Seland Newydd, Ffiji, Ciribati, Ynysoedd Marshall, Taleithiau Ffederal Micronesia, Nawrw, Palaw, Samoa, Ynysoedd Solomon, Tonga, Twfalw, Fanwatw, Unol Daleithiau America, Canada, Mecsic, Gwatemala, El Salfador, Hondwras, Nicaragwa, Costa Rica, Panama, Colombia, Ecwador, Periw a Tsile.

Mae ganddo arwynebedd o 179.7 miliwn km² (35% o arwynebedd y ddaear) ac mae'n cynnwys tua 723.7 miliwn km³ o ddŵr. Mae dyfnder cyfartalog y Cefnfor Tawel oddeutu 4,028 m, ac mae'n cynnwys y lle dyfnaf yn y byd: dyffryn hollt Marianas sydd 11,034m o dan lefel cymedrig y môr. Mae 15,500 km (9,600 milltir) o bellter rhwng y Môr Bering yn y gogledd a Môr Ross yn Antarctica yn y dde, a 19,800 km (12,300 milltir) o Indonesia i glannau Colombia.

O'r Cefnfor Tawel gellir mynd i Gefnfor Arctig trwy Fôr Bering, i Gefnfor Iwerydd trwy Gamlas Panamá neu rownd Yr Horn neu yn yr haf ym 2007 roedd yn bosib heibio gogledd Canada (does dim llwybr trwy'r iâ yn arferol), ac i Gefnfor India o gwmpas Awstralia neu drwy ynysoedd de-ddwyrain Asia a Chulfor Melaka, un o'r dyfrffyrdd prysuraf yn y byd.

Gweler hefyd[golygu | golygu cod y dudalen]

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