A ridge of sand and gravel that connects an island to a mainland is a(n)_____.

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A tombolo is a ridge of sand and gravel that connects an island to a mainland. Barrier bars are similar to tombolos, but they parallel the coastline and form a protected bay. Spits are narrow strips of land that extend from the coast into the water. Estuaries are coastal areas where fresh water and salt water meet and mix, usually forming a wide, open bay. Jetties are structures built to protect a coastline or harbor from the force of waves or to aid navigation by providing a marked channel for boats.

A Ridge of Sand and Gravel That Connects an Island