Here is a map of the area with Helvar in it (Hommlet), the Moathouse, and the Temple of Elemental Evil. The map is from about 1231 AC.

The Forest of Celestria, home to the Sylvar elves (wood elves) is in perpetual Autumn (fall) as they were gifted the world tree, Carvalion, by the god Herne in 1325 BC.