When FLAAR mapped Topoxte Island in the 1970’s, it was an island. But then the lake rose up and covered over some of the smaller islands. But now, many decades later, the lake level has sunk so far that Topoxte is part of the mainland.
One elderly local person said that in the past the lake drained so much (from the Karst Formation caves) that it looked more like a river against the north bank, rather than the beautiful lake that you see today.
View of Topoxte Island from temple 216 in Yaxha