uated to the south of Mahatittha in the western coast (Vidanapathirana 2012,2013,2016).
There is evidence of a rectangular foundation among the ruins adjoining Abhyagiri watch found in this area is inscribed mahavata chathussala meaning a building open from all sides to same as an open hall or an ambalama.(Bell,1891:5,1893:4; Paranavitana,2001:150-151)
Bell has reported that the foundation on a rocky plane at Palugasvava village close to southern high way to be another ambalama. In metropolitan area ambalamas were constructed at points where cross road meet. Bell has recorded about two ambalamas constructed at a junction where three road meet (tun-man-handiya) on the southern and western high way. There had been another ambalama at a junction where four road meet (satara-man handiya) resting place for travelling from the northern eastern and north-eastern area.There is evidence of an ambalama and a gavu pillar in the city limits close to Tissavava on the southern high way. Hattavanagalla vihavamsaya andJataka-atuva-gatapadaya supposed to have been written at the time of Parakkramabahu II (1236-1270) and they mention about an ambalama and a wooden bridge constructed near Tissavava. Jataka-atuva-gatapadaya names the bridge as puvaraheya (Ja.16;Hat.21-25). The bridge is supposed to have been constructed on stone pillars set across a stream and they are paved with wooden planks. Road leading to Dakkhina- desa and Uruvala port had to cross this wooden bridge.During the reign of Parakkramabahu II there is recorded information to say that the construction of ambalam and bridges were done with the royal patronage. Stone bridges belong to historical age can treated across river and streams in the Dry Zone have been
Thus on the northern high way bridges at Halpan ela, Malvatu Oya, Kandara Uya near Tulavaliya, Kal Aru across Pavakkulam and Ulukkulam constructed to the advancement of infrastructure of northern high way (Vidanapathirana,2016). On the eastern high way up to Gokannatittha Malvatu Oya stone bridge at tai eastern gate of Anuradhapura stone bridge across Mahakanadara Oya and Hunukanadara Oya, Kongollava and Parangiyavadiya across Yan Oya remain as landmarks. Three bridges across Yan Oya have been identified in the eastern coast at Pallavavamka. A port to the north of the Gokannatittha and some more ports that have not been unidentified yet are assumed to have played a supportive role to the Gokanna harbour (Vidanapathirana &Karunatathne, 2015). Ports at the eastern coast seem to have gathered more prominence as a result of the changes in the trade monopoly in the Indian Ocean and the shifting of capital to Polonnaruva from Anuradhapura in 8thcentury AD.
On the main road to the port at Pallavavamka there was a stone bridge at Sangilikanadara Uya a tributary of Mavatu Oya from the north east to the Anuradhapura city. This main road had to pass the stone bridges at Rambava across Mora Oya and at Demodara across Yan Oya. There was another main road from the main road to Pallavavamka Port., to reach Kokilai lagoon. Stone bridge across Yan Oya Moragama is a landmark on the road. Another road deviating from the main road to reach Pllavavamka port reaches the port passing a stone bridge across Yan Oya at Kimbulpitiyava (Vidanapathirana &Karunatathne, 2015; Vidanapathirana 2016).
Branching from the eastern high way there was a road to reach Seruvila and Lankapattana across Kantale Ara Passing a stone bridge. Road to the Valachchne coastal area from Polonnaruva passes through Kasatota across river Mahavali ganga and Pollipota Ara situated at Kayankani in the eastern coast passing another stone bridge (Dayananda & Karunarathne, 2014; Vidanapathirana,2016). Although there were less settlement along this route there had been a well established infrastructure with the presses of temples monasteries along with an expansion of small scale tanks. Stone bridges at Kala Oya Radatota and the bridge at Mudennegama across Siyabalangamu Oya as landmarks on the road to Dakkhina-desa from Anuradhapura Vidanapathirana,2012). This road run parallel