Barro Colorado Island is located in the man-made Gatun Lake in the middle of the Panama Canal. The island was formed when the waters of the Chagres River were dammed to form the lake in 1913. When the waters rose, they covered a significant part of the existing tropical forest, but certain hilltops remained as islands in the middle of the lake. It has an area of 15.6 km2 (6.0 sq mi
Visitors are allowed on Barro Colorado Island. Access is, however, regulated by STRI. To visit the island, people must make a reservation with the staff and arrange for a tour. Tours generally include transportation to and from the island (often by boat from Gamboa), a 2–3 hour guided hike, lunch, and a visit to the museum. Hikes through the island offer the opportunity to spot several animals including monkeys, anteaters, birds and insects.