Rivers usually merge to form larger ones, but exceptions exist such as bifurcations when rivers split and flow in different directions, mainly near the sea, creating deltas. The Casiquiare Canal in South America is a prime example, linking the Amazon and Orinoco River systems. Bifurcations can also occur inland, creating “bifurcation islands,” like the massive Casiquiare Island in South America. In North America, lakes like the Committee’s Punch Bowl and Wollaston Lake have bifurcations that flow into different oceans, creating significant land areas surrounded by water. This highlights the hidden colossal bifurcation islands, suggesting a revised list of the world’s largest islands.
https://starkeycomics.com/2021/06/10/bifurcation-the-secret-giant-islands-formed-when-rivers-split/