sandy beach

i am using an ashenvale tileset for my map and i want to have a beach,
i can use custom tileset to add sand from the sunken ruins tileset but i cant have sandy cliffs, meaning i cant have sand go into the water like a beach does

EDIT: it looks sorta silly with a grass cliff and then as close to the edge as possible, sand

is there a way to get sandy cliffs or sand going into the water like a beach?

Fairly simple solution:
1.) Start the terrain of your map in deep water (yes the entire map).
2.) Use apply height: raise to raise all of the ground above sea level, now you can create rivers/seas/streams by simply lowering the ground level (& w/o the awkward cliffs).
:D