3

Isthmuses of the World

4

Victoria Falls, Zimbabwe/Zambia

3

Coastal Plains of the World

3

Coral Reefs of the World

3

Wetlands of the World

4

Chip's Tips on Kenya

4

Table Mountain, South Africa

3

Archipelagos of the World

4

Chip's Tips on South Africa

3

Vasco da Gama

3

Gulfs of the World

3

David Livingstone

3

Straits of the World