Question: Which lake near the High Still ridge is owned by the National Trust?
Context: Brancaster Manor is a saltmarsh owned by the National Trust near Brancaster, Norfolk covering 810 ha (2,000 acres).  It was originally purchased by the Brancaster Memorial Trust in 1964, and transferred to the National Trust in 1967.  It is leased to Brancaster Staithe Fishermen's Society. High Crag stands at the southern end of the High Stile ridge which divides the valleys of Ennerdale and Buttermere in the west of the English Lake District.  It is often climbed as part of a popular ridge walk, from Black Sail youth hostel, or from Buttermere via Scarth Gap.  Panoramas of the Great Gable and the Scafells are visible. A national trust is an organisation dedicated to preserving the cultural heritage of a particular geographic region.  Although the focus of a national trust may vary by region, the principal role is to ensure the preservation of historically significant items, and to conserve areas of natural beauty.  National trusts generally operate as private non-profit organizations.  The first such trust organisation, The Trustees of Reservations, originated in 1890 as a regional group serving the state of Massachusetts, USA.  The first national trust, the National Trust for Places of Historic Interest or Natural Beauty, was founded in England in 1895 and operates as a charitable organisation serving England, Wales and Northern Ireland (it is commonly known in the UK as the National Trust).  Other national trusts have since been set up around the world. Moss Eccles Tarn is a tarn on Claife Heights, near Near Sawrey in the Lake District, Cumbria.  It is currently owned by the National Trust for Places of Historic Interest or Natural Beauty and known as an attractive tarn for fishing and walking.  It is known for its association with Beatrix Potter – she owned the tarn and donated it to the National Trust after her death, and it served as inspiration for some of her stories. Malham Tarn is a glacial lake near the village of Malham in the Yorkshire Dales, England.  The lake is one of only eight upland alkaline lakes in Europe.  At an altitude of 377 m above sea level it is the highest marl lake in the United Kingdom.  Its geology, flora and fauna have led to it being listed under a number of conservation designations.  The site is currently owned by the National Trust, who lease part of the site to the Field Studies Council who offer residential and non-residential field courses there.  The site was the inspiration for Charles Kingsley's 1863 novel, "The Water-Babies, A Fairy Tale for a Land Baby". The National Trust Company was incorporated on August 12, 1898 under the name of The National Trust Company of Ontario Limited.  In 1899, with the opening of an office in Montreal, the name was changed to The National Trust Company, Limited.  In 1984, National Trust amalgamated with The Victoria & Grey Trust Company and the company once again changed its name, this time to The National Victoria & Grey Trust Company.  Because the name was deemed too cumbersome, however, it was subsequently changed to the National Trust Company on June 3, 1985.  On August 14, 1997, Scotiabank purchased the National Trust Company. Buttermere is a lake in the English Lake District in North West England.  The adjacent village of Buttermere takes its name from the lake.  Historically in Cumberland, the lake is now within the county of Cumbria.  It is owned by the National Trust, forming part of their Buttermere and Ennerdale property. Below is a list of the stately homes, historic houses, castles, abbeys, museums, estates, coastline and open country in the care of the National Trust in Wales, grouped into the unitary authority areas.  Many areas of land owned by the trust, both open-access and closed to the public, are not listed here.  This is a list of the more notable sites, generally defined as those having either an entry in the National Trust handbook, or a page on their website.  There are many other areas of moorland and open country, agricultural holdings and coastline belonging to the National Trust, that are not listed here. National Trust Magazine is the members’ publication of National Trust for Places of Historic Interest or Natural Beauty.  With a readership of over 4 million (ABC 2,165,142) it currently has the highest magazine circulation in Britain.  Three issues are sent out every year - spring, summer and autumn – and are delivered as part of the National Trust members’ mailout, which includes local newsletters and other information for Trust members. The National Trust for Nature Conservation (NTNC), (राष्ट्रिय प्रकृति संरक्षण कोष) previously known as King Mahendra Trust for Nature Conservation is a Nepalese non-governmental organization working in the field of nature conservation. It was established in 1982 as an autonomous non profit organization by legislative law of Nepal.  NTNC's mission is to conserve nature and natural resources in Nepal while meeting the needs of the people in sustainable way.  Geographically, the Trust activities have spread from the sub-tropical plains of Chitwan, Bardia and Kanchanpur in the lowlands to the Annapurna and Manaslu region of the high Himalayas, including the trans-Himalayan region of Upper Mustang and Manang.  Currently, the projects of Trust are divided into three geographical areas - the lowland, the mid-hills (Kathmandu Valley) and the high mountains.  The Trust’s activities in the lowlands are based in and around the Chitwan National Park, the Bardia National Park and the Shuklaphanta Wildlife Reserve located in the central, western and far-western development regions of Nepal, through the Biodiversity Conservation Center (BCC) in Chitwan, the Bardia Conservation Program (BCP) in Bardia and the Suklaphanta Conservation Program (SCP) in Kanchanpur.  Similarly, the Annapurna Conservation Area Project (ACAP), the Manaslu Conservation Area Project (MCAP) and Gaurishankar Conservation Area Project (GCAP) are three protected areas managed by the Trust in the mountain region.  The Central Zoo is the only project of the Trust in Kathmandu Valley.  As a new initiative, the Trust has established an Energy and Climate Change Unit to address the emerging issues of climate change through mitigation and adaptation approach and renewable energy technologies.  The Trust has also started work on urban environment conservation with the Bagmati River Conservation Project.
Answer: Buttermere