1) The Tonkin region in Vietnam is known for its stunning landscapes.

2) The Tonkin Incident was a key event leading to the start of the Vietnam War.

3) My favorite dish at the Vietnamese restaurant is the Tonkin-style pho.

4) Tonkin bamboo is a popular choice for creating eco-friendly products.

5) The Tonkin Free School was established to provide education to children in the region.

6) Tonkin Gulf is a body of water located in the northern part of the South China Sea.

7) The Tonkin Snub-nosed Monkey is an endangered species found in Vietnam.

8) Tonkin was part of French Indochina during the colonial period.

9) The Tonkin region offers a wide variety of cultural experiences for tourists.

10) Many political reforms were implemented in Tonkin during the 19th century.