Seacoast Enterprises Associates (S.E.A.) operates four Marinas and two full service boat yards on Three Mile Harbor in East Hampton, NY. (S.E.A.) is your complete Hampton’s marina resource for both expert boaters or novices just starting out.

We provide the highest quality sailboat rigging, boat mechanics, hamptons slip rentals, winter storage, ships stores, parts department, mobile marine services and much more. The (S.E.A.) marine professionals, work hard to make sure you will have an amazing Hampton’s boating experience this season.

East Hampton Marina Locations

Whether you are an expert boater, a novice just starting out, a Hampton’s local, or new to the area, we are happy to help at Seacoast Enterprises Associates (S.E.A.). We are a premier East Hampton marina operating company. Enjoy sailing, fishing, water sports, cruising, power boating, sightseeing, or just relaxing – we are proud to help make your experience a wonderful time to remember at one of our East Hampton Marinas.

Harbor Marina

Find us at: Latitude 41°034444 Longitude -72°187999

Harbor Marina is a full service marina and boatyard with a fuel dock, a fully stocked ship’s store, a full marine service department and waterfront restaurant. The facilities are located on over eight acres at the channel entrance to Three Mile Harbor. Boaters will find unparalleled waterfront access and a protected upland storage area, available year-round. Amenities include:

  • FLOATING DOCKS
  • SEMI-PRIVATE SLIPS
  • ELECTRIC AND WATER HOOKUPS
  • DRY RACK
  • VALVTECT GAS AND DIESEL FUEL
  • SHIP’S STORE & GIFT SHOP
  • WATERSIDE RESTAURANT
  • FULL SERVICE DEPARTMENT
  • GAS AND DIESEL ENGINE DEALERSHIPS
  • 10 & 25-TON LIFTS
  • 3-ACRES OF UPLAND STORAGE
  • FREE WIFI
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Halsey’s Marina

Find us at: Latitude 41° 005164 Longitude -72° 183571

Halsey’s Marina is a peaceful location for enjoying an evening on your yacht, watching an East Hampton sunset, or spending time with friends. The protected and picturesque marina basin contains 41 slips that will accommodate vessels from 28’ to 85′.

Amenities include:

  • FIXED DOCKS
  • SEMI-PRIVATE SLIPS
  • ELECTRIC AND WATER HOOKUPS
  • CLUBHOUSE
  • RESTROOMS/SHOWERS
  • GRILLING AREA
  • LAUNDRY
  • DEDICATED PARKING SPACES
  • FREE WIFI
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Gardiner’s Marina

Find us at: Latitude 41° 005164 Longitude –72° 183571

Gardiner’s Marina is a great location for enjoying a peaceful evening on your boat, watching an East Hampton sunset, or spending time with friends. The protected and picturesque marina basin houses 45 slips that will accommodate vessels from 20’ to 110′.

Amenities include:

  • BULKHEAD DOCKS
  • FLOATING DOCKS
  • ELECTRIC AND WATER HOOKUPS
  • CLUBHOUSE
  • GRILLING AREAS
  • RESTROOMS/SHOWERS
  • LAUNDRY
  • PARKING BEHIND YOUR VESSEL
  • FREE WIFI
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Three Mile Harbor Marina

Find us at: Latitude 41° 001 Longitude -72° 182

Three Mile Harbor Marina is a full service marina and boatyard with a well-stocked ship’s store. The facilities are located at the “Head of the Harbor” in Three Mile Harbor. Boaters will find waterfront access to their vessels from floating docks. The facility is unique with its offering of a large indoor storage facilities with 40-Ton travel lift capacity. Amenities include:

  • CLUBHOUSE & SOCIAL AREAS
  • RESTROOMS & SHOWERS
  • LAUNDRY FACILITIES
  • FLOATING DOCKS
  • ELECTRIC AND WATER HOOKUPS
  • 2000 SQ FT SHIP’S STORE
  • FULL SERVICE DEPARTMENT
  • 40-TON LIFT
  • GAS AND DIESEL ENGINE DEALERSHIPS
  • INDOOR OR OUTDOOR STORAGE
  • FREE WIFI
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Three Mile Harbor Moorings

Looking for a great deep water mooring field for your next tour or cruise? Look no further than the Three Mile Harbor Moorings managed by Seacoast Enterprises Associates. We have 5 deep water transient moorings located along the South East side of beautiful Three Mile Harbor. With deep water access in the channel, the Three Mile Harbor Transient Moorings, are available for vessels up to 65 feet. A small dinghy is recommended to access the dinghy dock at Three Mile Harbor Marina with access to the bathroom facilities and the Three Mile Ship’s Store. Contact the Dock Masters on VHF9 for mooring and dinghy dock locations or call 631-324-1320.

Just a walk south from the Three Mile Harbor Marina, guests will find a family run Grocery Market and Deli, and a small neighborhood Restaurant. Please join us this season for a safe, fun visit in beautiful Three Mile Harbor. Amenities include:

  • Deepwater Transient Moorings
  • Beautiful, Protected Mooring Field
  • Dinghy Dock and Bathroom Facilities
  • Fully Stocked 3Mile Ship’s Store
  • Walk to Grocery Market with Delicatessen and Restaurant
  • Bike or Taxi to East Hampton and Amagansett Villages