Tremadog Bay is a large, open coastal bay in Gwynedd, North Wales, noted for its scenic backdrop of the Snowdonia mountains and the Rhinogydd range. The bay's waters are generally calmer and more gently shelving compared to the adjacent, more exposed Cardigan Bay coastline. The area is characterized by long, sandy beaches, such as Morfa Bychan, which connects to Criccieth beach at low tide. Paddlers can launch directly into the bay from locations like Porthmadog Harbour, where a public slipway on Pen y Banc provides access to the tidal mouth of the Afon Glaslyn. Other notable beach access points for paddlers include Llandanwg Beach on the bay's southern side and Abersoch on the Llyn Peninsula, which offers a leeward position with views across the bay. The bay is a saltwater environment with significant tidal influence, and paddlers must be aware of the tidal causeway accessing locations like Shell Island. Weather conditions dramatically affect the paddling experience; it can range from an endurance test in wind and waves to a calm, Mediterranean-like paddle. The bay sees considerable boat traffic, especially in summer, with sailing dinghies, powerboats, and jet skis congregating around popular areas like Abersoch, requiring vigilance from paddlers. Wildlife sightings of dolphins, seals, and jellyfish are common. The water temperature is influenced by the Gulf Stream, with the warmest seawater typically occurring in August and September. The coast is part of the Snowdonia National Park and features historic sites like Criccieth Castle overlooking the bay. Facilities are seasonal, with watersport equipment rentals and lessons available at main hubs during the warmer months.