How many states are in the
Central Region?

13 states

Explanation:

do you need to know specific?

Four of nine Census Bureau Divisions, have names containing "Central", though they are not grouped as a region. They include 20 states and 39.45% of the U.S. population as of July 1, 2007. Almost all of the area is in the Gulf of Mexico drainage basin and most of that is in the Mississippi Basin.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.