As dawn breaks over the waterlogged plain along the border Greece shares with Turkey, an all-too-familiar outline of refugees emerges through the morning haze, picking their way through a road well travelled by thousands before them. Young parents carrying infants and widowed women following railway tracks they hope will lead them to a town have become a common sight in the fields at Greece's north-eastern border region with Turkey. Two years after a sea passage used in a mass migration wave from Turkey to Greece's islands was effectively sealed, more and more refugees are re-discovering an old smugglers' route through the watery land border splitting the two countries. In April alone, at least 2,900 people arrived in Greece via Evros, the river border separating Greece from Turkey. That equals half the estimated arrivals for 2017 overall, United Nations refugee agency UNHCR said on April 27. REUTERS/Alkis Konstantinidis SEARCH "EVROS MIGRANTS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. Matching text: EUROPE-MIGRANTS/GREECE-EVROS