A coast can be described as overrun and as empty by two people visiting on the same day. Both are accurate, because visitors distribute themselves along a shoreline extremely unevenly.
Access points concentrate everyone
Almost all coastal visitors arrive by car, and the number of places to leave a car on any given stretch of coast is small and effectively fixed.
Crowds therefore form as circles around car parks rather than spreading evenly, with density falling sharply within a short walk of the entry point.
The practical consequence is that a beach can be packed at one end and near-empty forty minutes along, with no difference in the quality of the sand.
Facilities anchor the concentration
Toilets, cafés, lifeguard cover and equipment hire all sit at the access point, and a large share of visitors will not move far from them.
Families with young children and anyone carrying substantial equipment have good reasons to stay close, which is why the pattern repeats so consistently.
Removing the need for those facilities, by carrying water and food, is what actually buys space rather than simply travelling further along the coast.
The published beach is not the only one
Tourist information concentrates on a handful of named beaches per region, and those names propagate through guides, listings and photographs until they define the coast.
Unnamed coves between them receive a fraction of the traffic despite often being reachable on foot from the same car park.
Reading a detailed map rather than a destination guide is the most reliable way to find them, since the map shows access rather than reputation.
Tide changes the available area dramatically
On coasts with a large tidal range the usable beach can multiply in size between high and low water, which changes perceived crowding completely.
The same number of people on the same beach feels oppressive at high tide and sparse three hours later, with no change in visitor numbers at all.
Timing an arrival to a falling tide is therefore one of the more effective ways to avoid crowds, and it costs nothing beyond a little planning.
Time of day matters more than time of year
Coastal visitor numbers peak in the middle of the day and fall away sharply either side, since most arrivals are day trips built around a drive.
Early mornings and late afternoons in peak season are frequently quieter than the middle of a shoulder-season day, with better light and easier parking.
Staying nearby rather than driving in is what makes that possible, which is one of the more concrete arguments for accommodation on the coast itself.