Final answer:
Harland and Wolff, the shipyard where Titanic was built, is located in Belfast, Northern Ireland.
Step-by-step explanation:
The shipyard where the Titanic and her sister ship were built is located in Belfast, Northern Ireland. This shipyard, known as Harland and Wolff, has a significant place in maritime history, especially regarding the construction of the Olympic-class ocean liners, which included the ill-fated RMS Titanic.