The commercial center of town, Analakely, is located on the valley floor between these two ''ville moyenne'' hill ranges. King Andrianampoinimerina established the city's first marketplace on the grounds today occupied by the market's tile-roofed pavilions, constructed in the 1930s. Andrianampoinimerina decreed Friday (''Zoma'') as market day, when merchants would erect stalls shaded with white parasols, which extended throughout the valley forming what has been called the largest open air marketplace in the world. The market caused traffic congestion and safety hazards prompting government officials to divide and relocate the Friday merchants to several other districts in 1997. The city's other main commercial and administrative neighborhoods, which spread out from Analakely and extend into the adjacent plain, were established by the French, who drained and filled in the extant rice fields and swampland to create much of the area's design and infrastructure.  The ''Avenue de l'Indépendance'' runs from the gardens of Ambohijatovo south of the market pavilions, through Analakely to the city's railroad station at Soarano. To the west of Soarano lies the dense commercial district of Tsaralalana; it is the only district to be built on a grid and is the center of the city's South Asian community. Behoririka, to the east of Soarano, is built around a lake of the same name and abuts the sprawling Andravoahangy district at the eastern edge of the city. Antanimena borders Soarano and Behoririka to the north. A tunnel built by the French in the early 20th century cuts through the hillside; it connects Ambohijatovo with Ambanidia and other residential areas in the south of the city.