Siao-you-keng is one of the main entrances to Qi-xing Mountain Trail.
Following the signs, you'll see the smoking volcanic crater after going through the visitor center and some bamboo forests.
With its geological landscape formed during the post-eruption era, Siao-you-keng has one of the two volcanic craters in Yangmingshan.
Upon approaching it, you'll smell heavy sulfur. The fact that you'll need to pass through smelling sulfur fumes before going uphill makes it the most distinctive Qi-xing Mountain hiking trail.
Be sure to apply sunscreen as there are few shade trees along the way.
This is the only trail allowing you to see the volcanic terrain from the vicinity of a highway.
You get to see this smoking volcanic crater from many scenic spots in Yangmingshan National Park.
You'll have different viewing pleasures when admiring it from different perspectives.
Japonica Rice Story House
There is a map of Bamboo Lake and Siao-you-keng in Bamboo Lake Japonica Rice Story House.
It tells you from which spot you can view Siao-you-keng.
There is also an enlarged image of Siao-you-keng inside the story house.
You can get a view similar to the below picture on Balaka Highway.
The pictures below were taken from a scenic overlook on a pedestrian separation lane while on our way to Datun Nature Park.
White sulfur fumes emanating from the gray volcanic terrain suddenly appear in the green mountain scenery.
The road beneath Siao-you-keng in the picture is Yangjin Highway.
The bridge that you see when crossing the valley beneath the volcanic crater is Siao-you-keng Bridge.
It's almost like having the crater right above your head when you look up from the bridge.
Don't stay around for too long due to a landslide occurrence.
Another spot is Zhongzheng Shan Trail in Bamboo Lake.
Looking beyond the Calla Lily field, you can see the Siao-you-keng at the foot of Qi-xing Mountain.
Siao-you-keng is possibly an euphony meaning "smaller sulfur-mining pit," where Siao means "small," You means "sulfur" and Keng means "pit."
小油坑可能是諧音，意思是小一點的採硫坑。「Siao」是小, 「You」是硫, 而「Keng」是坑。
Therefore, there is actually Da-you-keng, where Da means "big." It can be found on your way to Fish Road Historic Trail.
With the biggest fumarole in Taiwan, Da-you-keng is larger than Siao-you-keng. A British company used to have a sulfur-mining operation here.
Due to the extremely fragile land structure, the national park has closed this scenic spot to prevent tourists from entering.