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The Islands of the Allegheny River If you travel up the Allegheny River from Point State Park, you might be surprised to find many islands along the way. These islands have a very rich history dating back thousands of years. Many of the islands were formed from rich, glacial sediment, as the Allegheny River is the product of the continental glacier which melted 16,000 years ago while some islands have been formed by rivers picking up sediment like sand and mud and depositing