The northern shore of North Stradbroke Island faces essentially due north and runs for 13 km from low, sandy Amity Point to 25 m high Point Lookout, the north-east tip of the island. In between are four sandy beaches, the eastern three bordered by rocks and headlands, together with the growing town of Point Lookout, which now backs about 3 km of the north-eastern corner of the island.Flinders beach (1581) is an 8 km long, north-east to north facing beach, bordered by Amity Point and extensive tidal shoals in the west and the 20 m high Rocky Point in the east. Between the two points, the shoreline has built out 1 to 2 km over the past few thousand years as a series of foredune ridges and spits, backed by an extensive swamp that is drained by two small creeks, one in the centre and one just west of Rocky Point. There is vehicle access to the beach toward the western end along the Flinders Beach Road, which also leads to a camping area and car park, and in the east at Adder Rock, where there is also a beachfront caravan park. The beach has a relatively low gradient and is either barless or fronted by a narrow continuous bar, particularly toward the east. Seaward of the bar, sand moves from east to west in the form of elongate sand waves and bars, which result in a highly variable outer surf zone. During high swell a strong westerly drift runs along and off the beach.
Lamberts Beach (1114) is the northern of Mackay’s two main surfing beaches. It is located just 1 km south of Slade Point, with a lookout on the southern part of the point providing an excellent view of the beach. The Slade Point Road runs right behind the beach. The beach is 500 m long, faces due east and is bordered by a prominent, 40 m high headland and lookout at the northern end, and a lower rocky platform and reef at the southern end. A 100 m wide grassy park, with amenities, backs the beach, with casuarina trees also fringing the back of the beach. The beach is composed of coarse sand and some gravel, which produces a steep high tide beach, while at low tide it is fronted by a 50 m wide bar that is usually cut by three rip currents and channels (Fig. 4.61). Waves average 0.5 to 1 m, making it one of the more exposed and higher energy beaches in the area (Fig. 4.62). Lifeguards patrol the beach during the Christmas and Easter holidays.
The main Yallingup Beach (WA 716) extends north of the car park for 1.3 km to the beginning of a section of steep calcarenite bluffs and backing slopes, which rise to 173 m at Wardanup Hill. The curving beach faces west with wave height increasing up the beach.In the more protected southern corner waves average about 1 m and break across a low tide terrace. Wave height increases up the beach as the surf zone widens and is cut by strong permanent rips against the central reefs and usually a beach rip to either side.The reef area provides good surf, but is hazardous for swimmers. The main settlement and rows of houses back the southern part of the beach, with the surfers car park in lee of the main central reef break. Some active dunes extend north of the car park before the bluffs and rock platforms begin to dominate the shore to the north.