Rather than try and list out some top individual maps, we’ll look at the key repositories and summarize some of the options. Unlike what typically happens with mods, custom maps for Warcraft 3 specifically are meant to go in the Warcraft 3 folder in your user documents area. There are hundreds if not thousands of options for custom Warcraft 3 maps, and plenty of places to go grab them. But even as these spin-off games rocket to new heights, people still want to download new and interesting maps for Warcraft 3, a tradition that seems to have continued through to Warcraft 3: Reforged.
So, you want to download some Warcraft 3 maps? Custom maps and modes is a long-held tradition in RTS games, and in fact it was a custom map/mode combination for Warcraft 3 called Defence of the Ancients that gave rise to what we now know as the MOBA.