Geography containing OA-OZ

Can you guess these entities from around the world whose names contain the sequence of letters "oa", "ob", and so on? I have given some crossword-type clues to assist in working out the missing letters of the answers.

For example, the clue "Astound endlessly at Brazilian river" could be AMAZ-(on).

Decided to go for bodies of water only, for this one.

For my full cryptic geography series, click here

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Last updated: January 24, 2026

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First submitted	November 12, 2025
Times taken	6
Average score	15.4%
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Contains:

Clue

Answer

The stream which is the source of the Missouri; the name means "Devil's lair, making a noise like a lion" (16 letters)

Hell Roaring Creek

The 7th-longest river in the world, in Russia

Where you would go swimming off the coast of Perth, W.A. (11)

Indian Ocean

Body of water in the trees of Minnesota, Ontario and Manitoba (14)

Lake of the Woods

Weird aurora is visible, if you consume stir-fried rice at this Brazilian tributary; you see the first half of a rarity, an ice phenomenon (10)

Uraricoera

The gulf on which Helsinki is located (13)

Gulf of Finland

Europe's biggest lake, where the family pet likes to splash around (10)

Lake Ladoga

River with a U.S. state named after it (4)

Ohio

The longest river entirely in France (5)

Loire

Faintly visible, a river flowing through Osaka (6)

Dojima

Huge, frozen expanse under an Antarctic glacier (10)

Lake Vostok

The sea on Sulawesi's east coast (10)

Molucca Sea

River of Bolivia where one has most of a tablet, in company, along with some egg-based sauce (9)

Pilcomayo

Shallow, enclosed bay where a famous Italian tourist destination is found (14)

Venetian Lagoon

The gulf which starts at Anchorage, named after an English sea explorer (9)

Cook Inlet

South African river in which one may struggle to walk, before surgery requiring a certain blood type (7)

Limpopo

Waterway of New York state; similar to the word for a bunch of flowers (11)

Boquet River

Man-made channel crossing the isthmus south of Athens, whose name appears in the title of a book of the New Testament (11)

Corinth Canal

The strait crossed by the bridge at Istanbul, where poor subs may sail (8)

Bosporus

Inlet of the NW Pacific, bounded by Kamchatka to the east (12)

Sea of Okhotsk

Oceanic area between the Philippines and Vietnam (13)

South China Sea

The narrow eastern end of the English Channel (13)

Strait of Dover

The large bay between Korea and eastern China (9)

Yellow Sea

Shallow sea on the south of Baffin Island; contains the name of a mammal (9)

Foxe Basin

Inlet of the Pacific which touches Costa Rica, perhaps a place of theft? (12)

Gulf of Nicoya

Melon man takes a beach quiz, off the coast of Madagascar (17)

Mozambique Channel

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