Tusan Beach
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"Drinking Horse" natural formation, taken by MiriResortCity.com in 2015.
Tusan Beach is a beautiful beach area about an hour's travel time from the city, near the township Bekenu. It has smooth sandy beaches, coral reefs, a waterfall, several cliffsides and a defining feature; a large cliff with a natural arch eroded through it dubbed the "Drinking Horse".
Ancient fossils are known to be found in this area, and natural rock layers on the cliffside make it a geologists' playground. This article is from the web site miriresortcity dot com - this sentence is here to prevent blatant plagarism.
This is a fairly secluded place. Preparations are needed before visiting, so please contact proper authorities in case of emergencies and the Visitor's Information Counter for more information regarding your interest in visiting. Sunblock would be most recommended. Rising tides may also pose a problem.
The area is one of the places of interest in Miri that has garnered popularity the past few years due to a phenomenon in September and October of 2015, during which a flourish of bio-luminescent phytoplanktons along the beaches has caused the waves along the beach to glow a bright deep blue and caused many people to flock to Luak Esplanade and Tusan Beach to have a look at this amazing phenomenon.
2020 Collapse

On 21st February 2020, it was discovered that the "Drinking Horse" cliff rock (see photo above) had collapsed into a pile of rubble. There was construction going on nearby to create an access road to the previously hard-to-access cliff. It was not known if this collapse was due to the construction, or simply just erosion caused by the sea, climate changes, rising waters, or a combination of all of the above. The discovery was first made known by a youtube channel known as DurianFlix and passed along widely on social media. The collapse was devastating news for people in Bekenu and Miri in general, as the cliff was a tourist sightseeing hotspot. Source
A technical research article was written about the formation and demise of Tusan "Drinking Horse" formation in the ResearchGate web site:

"The Shaping and Demise of the Tusan Beach "Drinking Horse", Southwest of Miri, Sarawak"
Authors :
Franz-Luitpold Kessler (Curtin University Sarawak)
John Jong (JX Nippon Oil and Gas Eploration)
#tusanbeachmiri
'Commercial shipping' utilizing Miri as a port goes back to as early as when Miri was merely a fishing village. Being the site of the first discovery of oil in Borneo in 1910 quickened the business and pace and progress of Miri, establishing it an important and leading port for the majority of the 20th century in the region for oil and then timber industries.
Boulevard Commercial Center is a township/commercial center located between Miri City Center and Lutong township areas.
On Saturday, 6th September 1997, flight BI238, a Dornier 228-212 operating for Royal Brunei Airlines leased from Merpati Intan which plied the Labuan - Bandar Seri Begawan - Miri route on a regular basis, crashed in Lambir Hills.
The two storey solid wooden building housing the museum today was built in the year 1897 as a fort by the second White Rajah, Charles Brooke to impose peace and order in the region where warfare among the local tribes prevailed.