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:
Melbourne

Context:
The Hoddle Grid (dimensions of 1 by 1⁄2 mile (1.61 by 0.80 km)) forms the centre of Melbourne's central business district. The grid's southern edge fronts onto the Yarra River. Office, commercial and public developments in the adjoining districts of Southbank and Docklands have made these redeveloped areas into extensions of the CBD in all but name. The city centre has a reputation for its historic and prominent lanes and arcades (most notably Block Place and Royal Arcade) which contain a variety of shops and cafés and are a byproduct of the city's layout.

Question:
Which edge of the Hoddle Grid fronts onto the Yarra River?

southern