Remember even if all you have are geese of the same breed, come breeding season (if you have ganders and geese both) you will want to split up the pairs or trios and not leave them all together. Unless you dont mind hormone fights, neck grabbing, wing beating and feather pulling.
x2 what Iain said about electric fencing. The electric poultry netting is different than hotwire lines. We use field fencing around the entire property. It is no climb sheep/goat style and works well with the geese too. We use catch corners made from other fencing to herd groups into so they arent running towards/into the field wire.