From resortsen Costa Mar in Playa de Los Cristianos and north of Costa Adeje is a walkway by the sea which is largely separate from car traffic, called Beach Promenade.
There are both used ceramic tiles and concrete surfaces, and I think it's a little asphalt, too. At a short distance of approx. 30 m, where there is a new path, it is sand.
I choose to say that the front end on a beach in the north. Of course it is possible to go on, but you must first go over a beach and continue on the sidewalk on the street. Then I think it would be wrong to call it the Beach Promenade.
I've heard different numbers where long boardwalk is, but my wife and I have gone all over the boardwalk 2-3 years ago, and my GPS measured distance between caches Nordlandsbana South and Nordlandsbanen north to 10.3 km.
The name suggests that it is a train, but in the small village of Ballangen in northern Norway where I was born, we have a road that some people with humor that has called Nordlandsbanen.