▁About ▁ 5 . 9 ▁million ▁people ▁live ▁in ▁the ▁W inds or - Det roit ▁region , ▁making ▁it ▁one ▁of ▁the ▁largest ▁metropol itan ▁areas ▁in ▁North ▁America . ▁An ▁estimated ▁ 4 6 ▁million ▁people ▁live ▁within ▁a ▁ 3 0 0 - mile ▁( 4 8 0   km ) ▁radius ▁of ▁Metro ▁Detroit . ▁Thus , ▁the ▁met ro ▁area ▁has ▁many ▁opportun ities ▁for ▁growth ▁in ▁tour ism ▁with ▁great ▁potential ▁for ▁development ▁and ▁expansion . ▁The ▁region ' s ▁abund ance ▁of ▁natural ▁la kes ▁and ▁coast al ▁landscape ▁present ▁invest ment ▁potential ▁for ▁beach front ▁resort s ▁and ▁lux ury ▁high ▁rise ▁cond omin iums . ▁▁ ▁In ▁addition , ▁there ▁is ▁the ▁Detroit ▁River ▁International ▁Wild life ▁Ref uge ▁which ▁is ▁the ▁only ▁international ▁wild life ▁preserve ▁in ▁North ▁America , ▁uniqu ely ▁located ▁in ▁the ▁heart ▁of ▁a ▁major ▁metropol itan ▁area . ▁ ▁The ▁refuge ▁includes ▁islands , ▁coast al ▁wet lands , ▁mar sh es , ▁sho als , ▁and ▁water front ▁lands ▁along ▁ ▁of ▁the ▁Detroit ▁River ▁and ▁Western ▁Lake ▁Er ie ▁sh or eline . ▁ ▁The ▁city ▁of ▁Detroit ▁functions ▁as ▁an ▁entertain ment ▁hub ▁for ▁the ▁entire ▁region , ▁ ▁as ▁cas ino ▁resort s , ▁major ▁sports ▁ven ues , ▁and ▁theatre ▁district ▁increase ▁development ▁prospect s ▁for ▁new ▁ret ail . ▁ ▁Detroit ▁is ▁the ▁largest ▁American ▁city ▁and ▁metropol itan ▁region ▁to ▁offer ▁cas ino ▁resort ▁hot els . ▁The ▁M GM ▁Grand