Karanja Fort and MumbaiFort early Portuguese fortifications were near each other, directly facing one another across the Mumbai Harbour

 

AI Overview

Yes, Karanja Fort and Mumbai's early Portuguese fortifications were near each other, directly facing one another across the Mumbai Harbour. 

When the Portuguese ruled the region from 1534 to 1739 AD, the local geography and administrative boundaries looked vastly different than they do today: 

Geographic Proximity

Karanja Fort: Located on Karanja Island (modern-day Uran, Navi Mumbai), this fort served as the extreme southern boundary of the Portuguese Província do Norte (Province of the North). 
Mumbai Fort / Castle: Before the British built the massive Mumbai Fort walls, the Portuguese maintained a fortified manor house (Casa da Orta) and an early warehouse fort (Fortaleza de Mombaim) right on the eastern edge of the Island of Bombay (now South Mumbai). 
The Distance: Separated only by the waters of the Mumbai Harbour, the two positions were roughly 10 to 12 kilometers apart by sea—making them highly visible to each other and strategically linked for controlling maritime entry. 

Strategic Relationship

The Portuguese purposefully paired these coastal strongholds to secure their trade networks. Karanja Fort guarded the southern mouth of the harbor and the Panvel creek, while the fortifications at Mumbai tracked ships moving deeper into the bay toward their main regional headquarters at Fort Vasai (Bassein).