noun
Refers to a fortified place or natural defensive position, often in historical or military contexts.
その城は天然の要害に建てられた。
The castle was built on a natural stronghold.
noun, noun which may take the genitive case particle 'no'
strategic position; key position
Used for a location or point that is strategically important, not necessarily fortified. Can also be used attributively with の.
This port is a strategic location for trade.