Water appearing over landscape

Hi I’m very new to unreal engine and I dont know if I have done something wrong, I’ve imported a custom height map from world machine into unreal I’ve added a simple texture to the map and when i add water-ocean it appears above my map both in the editor and when you play, I’ve tried moving it to the lowest point in my map but the problem it still persists, I can and will add any extra information and screen shots if needed

Thank you

is your landscape at 0,0,0 ? also how are you adding ‘water-ocean’