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 boat yard with a well stocked ship’s store. The location at the “Head of the Harbor” is the closest to the village of East Hampton and Amagansett.  Boaters will find waterfront access from floating docks. The facility is unique in the area with it’s offering of a large indoor storage facility with a 40-Ton Travelift capacity.

Amenities include:

  • FLOATING DOCKS
  • ELECTRIC AND WATER HOOKUPS
  • CLUBHOUSE
  • GRILLING AREAS
  • RESTROOMS/SHOWERS
  • LAUNDRY
  • SHIP’S STORE
  • FULL SERVICE DEPARTMENT
  • BOAT YARD
  • 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 from Seacoast Enterprises Associates (S.E.A.). We have 6 deep water transient moorings located in beautiful Three Mile Harbor. Make passage in the channel from the Inlet, down the length of the channel and into the mooring field, between two white mooring entrance markers, and proceed south to moorings labelled T1 to T6 on yellow floats. The moorings accommodate vessels from 20 to 100 feet, based on weather conditions. A Dinghy or Tender is recommended to access our private dinghy dock to the south at nearby Three Mile Harbor Marina. Bathroom facilities are available at Three Mile Harbor Marina and you can walk to the Three Mile Ship’s Store, a family run Food Market, Deli and Restaurant. Please join us this season for a safe, fun stay on beautiful Three Mile Harbor.

Amenities include:

  • Deepwater Transient Moorings
  • Private Dinghy Dock
  • Bathroom Facilities
  • Beautiful, Protected Mooring Field
  • Nearby 3Mile Ship’s Store
  • Walk to Food Market with Deli