在公布坐标处，有一座建于江心礁石上的红色灯塔。当珠江退潮时，礁石露出水面，灯塔的基座清晰可见。请你数一数塔基外面的爬梯有多少级台阶。X=横杆的数量。宝藏就藏在南岸河边的“1X8”号路灯附近。
你可以浏览Tideschart网站，选择合适的时候去观察灯塔。
A lighthouse situated on a reef in the middle of river can be found at the posted coordinates. During low tide, the reef emerges, revealing the base of the lighthouse. Please count the rungs on the ladder attached to the base. Let X be the number of rungs. The cache is hidden on the south bank of the river, near the streetlight No. 1X8.
You can consult the Tideschart for the optimal time to observe the lighthouse.