Undersea

Apron

U.APNU

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Arch

U.ARCU

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Arrugado

U.ARRU

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Borderland

U.BDLU

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Banks

U.BKSU

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Bank

U.BNKU

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Basin

U.BSNU

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Cordillera

U.CDAU

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Canyons

U.CNSU

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Canyon

U.CNYU

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Continental rise

U.CRSU

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Deep

U.DEPU

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Shelf edge

U.EDGU

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Escarpment (or scarp)

U.ESCU

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Fan

U.FANU

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Flat

U.FLTU

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Fracture zone

U.FRZU

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Furrow

U.FURU

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Gap

U.GAPU

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Gully

U.GLYU

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Hill

U.HLLU

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Hills

U.HLSU

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Hole

U.HOLU

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Knoll

U.KNLU

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Knolls

U.KNSU

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Ledge

U.LDGU

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Levee

U.LEVU

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Mesa

U.MESU

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Mound

U.MNDU

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Moat

U.MOTU

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Mountain

U.MTU

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Peaks

U.PKSU

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Peak

U.PKU

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Plain

U.PLNU

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Plateau

U.PLTU

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Pinnacle

U.PNLU

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Province

U.PRVU

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Ridge

U.RDGU

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Ridges

U.RDSU

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Reefs

U.RFSU

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Reef

U.RFU

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Rise

U.RISU

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Seachannel

U.SCNU

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Seachannels

U.SCSU

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Saddle

U.SDLU

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Shelf

U.SHFU

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Shoal

U.SHLU

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Shoals

U.SHSU

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Shelf valley

U.SHVU

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Sill

U.SILU

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Slope

U.SLPU

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Seamounts

U.SMSU

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Seamount

U.SMU

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Spur

U.SPRU

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Terrace

U.TERU

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Tablemounts (or guyots)

U.TMSU

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Tablemount (or guyot)

U.TMTU

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Tongue

U.TNGU

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Trough

U.TRGU

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Trench

U.TRNU

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Valley

U.VALU

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Valleys

U.VLSU

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