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"Ran Cheng Suo Yao blocks the mountain waist, snow-like waves fly up and echo with the angry tides"; these two lines of ancient poems from the Qing dynasty briefly point out the characteristics of the Beiguan. The Lanyang Plain is surrounded by mountains on three sides and faces the sea on the east, with a closed terrain. Therefore, the Qing government set up the Beiguan at the northern end and the Nan Guan at the southern end, which correspond with each other, becoming the gateways to enter and exit Lanyang. The Beiguan was built in 1819 by the Tongpan Gao Da'long. It has city towers, arrow walls, horse paths, cannon positions, and barracks. The large stones are arranged in rows, standing firmly and guarding the entrance to Lanyang. Unfortunately, it has been completely destroyed now, and the old traces are hard to find. However, "Beiguan's Sea Tides" was originally one of the "Eight Scenic Views of Lanyang." Today, standing on the Guanhai Pavilion at the Beiguan, looking far at the beautiful scenery of Guiyu and closely observing the waves crashing against the shore, it is still grand and magnificent. Especially during high tides or sunrise, it is the best time to visit Beiguan. Along the northeastern coast of Taiwan, there are many single-sided mountains, tofu rocks, and small headlands shaped by millions of years of erosion. Beiguan is the largest and most dangerous single-sided mountain. Nearby, there are also tofu rocks with the most regular shapes and small headlands with calm waves and little wind, forming unique natural landscapes. It has now been developed into the Beiguan Park by the Northeastern Coast Management Office. To the north of this area is the Sandiaojiao Peninsula as a barrier, and to the east flows the Kuroshio Current. Rare fish species such as blackfish, money eels, and sea bream often appear in this sea area, making it a popular spot for rock fishing. In addition, the Beiguan's fish soup is also well-known in the surrounding areas.