Which river merges with the MississipWhat happened when Huck woke up in canoe?

The river that merges with the Mississippi River is the Missouri River.

When Huck woke up in the canoe, he found himself alone and adrift on the river. He had no idea where he was or how he had gotten there. He was scared and confused, and he didn't know what to do. He drifted for a while, until he eventually came across a small island. He landed on the island and explored it. He found some food and water, and he built himself a shelter. He stayed on the island for several days, until he was eventually rescued by a passing steamboat.