Bellport Bay is a saltwater bay on the south shore of Long Island, forming part of the Great South Bay system. It is directly connected to the Atlantic Ocean through the Old Inlet, a breach in Fire Island created by Superstorm Sandy, which allows ocean water to flow in and out with each tide cycle. This connection creates significant tidal currents, particularly near the Smith Point Bridge and in Narrow Bay, where standing waves can form. Paddlers must plan trips around these tides, as the current lags behind Moriches Inlet by several hours. The bay is exposed to wind, and conditions can change quickly, making it suitable for intermediate to advanced paddlers when venturing into the open bay or towards Fire Island. A primary access point is Smith Point County Park, which features a paved ramp and parking for about 20 cars. This launch provides access to both Bellport Bay to the west and Narrow Bay to the east. Another launch is at Shirley Beach, a town beach with a short carry and parking for 15 cars, offering access to the bay and the mouth of the Carmans River. The mouth of the Carmans River, which flows into the northern end of Bellport Bay, provides a more protected route suitable for novices, allowing paddles upstream to Sunrise Highway. However, paddlers should be aware of significant recreational motorboat traffic, especially on summer weekends. A notable hazard is the potential for strong currents and wave action near the inlets and bridges. A rescue of an overturned kayaker in the bay has been documented, underscoring the need for preparedness. The scenery includes views of the Fire Island National Seashore and the Wertheim National Wildlife Refuge. Wildlife sightings include great blue herons, egrets, osprey, and deer. The water quality in the bay has been reported to have improved since the opening of the Old Inlet. For facilities, Town of Brookhaven and Suffolk County permits and fees may apply at certain launch sites, and paddlers should verify requirements in advance. The Bellport Village dock has a specific policy for kayak parking parallel along the east side.