Questions & Answers about guìtái zài nàbiān.
In this sentence, 在 means to be located at / to be in / to be at.
So 柜台在那边 means the counter is located over there.
This is one of the most basic ways to say where something is in Chinese:
thing + 在 + place
Examples:
- 书在桌子上。 = The book is on the table.
- 洗手间在那边。 = The restroom is over there.
Because 是 is usually used to connect one noun to another noun, like A is B.
Examples:
- 我是老师。 = I am a teacher.
- 这是柜台。 = This is the counter.
But for location, Chinese normally uses 在, not 是.
So:
- 柜台在那边。 = correct
- 柜台是那边。 = not correct for location