You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Oklahoma_City

Context:
Oklahoma City lies in the Sandstone Hills region of Oklahoma, known for hills of 250 to 400 feet (120 m) and two species of oak: blackjack oak (Quercus marilandica) and post oak (Q. stellata). The northeastern part of the city and its eastern suburbs fall into an ecological region known as the Cross Timbers.

Question:
Which region is Oklahoma city located in?

Sandstone Hills region