It is the island directly to the right of Fort Ridley, in the 3 o'clock position on the island map.

Igj

the "E's" are in different position. when he points to a certain "E" do the opposite position

Monster Carnival was an island concept that was partly shown in 2008 but never released. Its position as the 4th island of Poptropica was taken by 24 Carrot Island.

A river is a body of water. An island is a body of land. A river flows from point A to point B. An island stays in the same position.