Marina is the largest of the three neighbouring M3M projects in this part of Sector 68. Listing portals put the campus at about 13 acres, with roughly 10 towers of up to 29 storeys and around 1,100 homes. What sets it apart is water: the towers are planned around a landscaped lake edge, and the clubhouse is themed as a marina yacht club rather than a standard podium deck.
Homes are mid-sized by Gurugram standards. The 2 BHK layouts sit around 1,260–1,330 sq. ft., a 2 BHK-plus-study of about 1,500 sq. ft. turns up regularly on resale portals, and 3 BHK homes run from roughly 1,595 to 1,914 sq. ft., the bigger ones with three bathrooms. That spread suits families who have outgrown a compact 2 BHK but do not want luxury-tower prices.
If you are weighing up the neighbours: M3M Ikonic is the single-tower, 3 BHK-only option with higher per-sq.-ft. asks, while M3M Sierra68 is the lower-budget 2 BHK cluster. Marina sits in the middle, with the widest choice of sizes, the most live resale listings and the lake-facing homes that give the project its name.
The address works for people commuting to Sohna Road, Golf Course Extension Road or the office cluster around M3M IFC. M3M's own figures put Airia Mall about 2 km away, NH-48 (the old NH-8) about 5.5 km and Medanta about 7 km. The honest trade-off is the metro: the nearest station M3M lists is Sector 55–56, around 9.5 km out.
M3M India project page (incl. HARERA disclosure) & listing portals — Square Yards, NoBroker, Houssed, PropertyXpo