From Knokke-Heist and Zeebrugge By public transport

The long Belgium coast can best be explored by the coastal tram. It stops at 70 places, which means it always stops close by a place you want to visit. The coastal tram starts at De Panne, near the French border, and runs all the way to Knokke-Heist, near the Dutch border.

https://zeebrugge.net/en/kusttram.php