Brielle is bordered to the north and east by the borough of Manasquan, to the west by Wall Township and to the south by the borough of Point Pleasant Beach across the Manasquan River. Route 35 runs through the middle of the town and Route 70 runs along its western edge.
The borough is primarily a residential community of single homes, with a few condominiums; there are almost no undeveloped lots of land left. There are several businesses located along Union Avenue and Higgins Avenue and some marinas along the Manasquan River. Ripley's Believe It or Not! once stated that Brielle has "16 bars and no churches". It currently has one church, The Church in Brielle(formerly the Dutch Reformed Church) and several restaurants that have a liquor license, but no truebars. There is also a 140 acres (0.57 km2) 18 hole Manasquan River Golf Club.
The town has approximately 6.4 kilometers (4.0 mi) of waterfront along the Manasquan River, Glimmerglass, and Debbie's Creek, all of which are salt water and tidal. Brielle's borders extend to an 8-acre (32,000 m2) island in the Manasquan River.
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