BERLIN (AFP) - Britain's Jessica Ennis won her country's first-ever world heptathlon title here on Sunday after dominating the gruelling seven-discipline, two-day event. Ennis went into the final event, an energy-sapping 800m, 171 points ahead of Poland's Kamila Chudzik and produced a run of 2min 12.22sec to ensure her place atop the podium with a world leading total of 6,731 points. The 23-year-old, who had the best personal best around two laps of the top eight competitors, went out hard, overtaking Ukraine's Olympic champion Nataliya Dobrynska almost immediately and building up a 15-metre lead. She hit the halfway mark in 1:01.12 just as Jennifer Oeser was tripped, although the German regained her composure and gamely carried on. Dobrynska finally overtook Ennis with 120 metres to go but the Briton produced an astonishing kick down the final 20 metres to win the race. "In the 800m, I wasn't aware that Dobrynska was so close to me," said Ennis. "But I said to myself, 'I'm not going to let her pass me'. "It's been a long time since that bronze (in the 2006 Commonwealth Games). I've dreamt about the title, especially after last year's disappointment. It was a lot of pressure but I managed to do it." Oeser's courageous efforts through the field after her fall pushed her to silver on 6,493 points, with Chudzik claiming bronze on 6,471. Dobrynska finished in fourth on 6,444. Ennis had been seeking to succeed where compatriot and 2000 Olympic Games champion Denise Lewis had failed - she managed two world silver medals, and there had already been some contact between the two."I've already spoken to Denise Lewis and she said 'You've done amazingly well'," Ennis beamed. In the penultimate event, the javelin, Ennis managed a best of 43.54m, some distance off her personal best of 46.47m but tellingly, it was further than Dobrynska.The throw left the British girl on 5,799 points. Ennis jumped a best of 6.29m in the long jump, the fifth event, when Chudzik made her move with the day's best jump of 6.55m to claim fourth spot overall, just two points adrift of Oeser and Dobrynska. Ennis finished the first day on Saturday in top spot on 4,124 points after recording field leads of 12.93sec in the 100m hurdles, 1.92m in the high jump and 23.25sec in the 200m. Ennis, who was fourth in the Osaka worlds in 2007 but who missed the Beijing Olympics after sustaining three stress fractures in her right ankle, also set a personal best of 14.14m in the shot put - her weakest even along with the javelin. An impressive season's best of 15.82m in the shot saw Dobrynska move from sixth spot to second on 2,932 points. But a disappointing 25.02sec in the 200m saw the Ukrainian net only 885 points compared to Ennis' 1,054 for the discipline.