BPers, here are some more pictures of St Martin/St Maarten. I'm resending one I sent earlier because I forgot to explain it.
1) This is where the border crosses the road just west of Simpson Bay Lagoon. France on the right, Netherlands on the left.
2) Up the road on the French side is this sign about 50 meters from where the actual borderline is located.
3) The small white stone in front marks the actual border, as does the large obelisk. Although, the large obelisk is quite recent (1940s) as a commemorative marker. Directly behind the obelisk leading to the bay is the small stone wall. France or right, Netherlands on left.
4) Here's the small stone wall directly behind the large white border marker. France on right, Netherlands on left.