Between; in an intervening space.

बीच

English Usage: He sat betwixt his two friends.

Hindi Usage: वह अपने दो दोस्तों के बीच बैठा।

In the middle of; between.

बीच में

English Usage: There was a small house betwixt the mountains.

Hindi Usage: पहाड़ों के बीच में एक छोटा सा घर था।