Echo Lake is located in the town of Charleston in Orleans County, Vermont within a region known as the Northeast Kingdom. It is one of only two deep, cold, and oligotrophic lakes in the Clyde River system, the other being nearby Lake Seymour. The first Surveyor General of Vermont, Whitelaw, gave it the name of Echo Pond because when any sound …Echo Lake is located in the town of Charleston in Orleans County, Vermont within a region known as the Northeast Kingdom. It is one of only two deep, cold, and oligotrophic lakes in the Clyde River system, the other being nearby Lake Seymour. The first Surveyor General of Vermont, Whitelaw, gave it the name of Echo Pond because when any sound was produced in its vicinity it was reverberated in various directions, producing a series of echoes.