It is called the Golden Horn
Constantinople's harbor is Golden Horn.
The inlet that helps to form the natural harbor of former Constantinople is called the Golden Horn. This sheltered bay is located between the European and Asian sides of Istanbul and has historically served as a crucial maritime hub. The Golden Horn has played a significant role in trade and defense throughout the city's history.
No, spacious is an adjective. Spacious is not an activity.
most spacious
It was 800 miles from Rome, surrounded by three sides of water, stood at the crossroads of Asia and Europe, and it's harbor could easily be guided from attacks.
Spacious is an adjective.
the dorm in the hotel was so spacious.
Constantinople
I can give you several sentences.This room is very spacious.Our deck has a spacious view."Oh beautiful, for spacious skies ..." (from "America the Beautiful")The new house is much more spacious than it appears from the outside.
The usual antonym for spacious is confined.
Constantinople was in Greece.
The house was a spacious, at 3500 square feet.