Question: Dorback Burn, Findhorn is a tributary that emerges from which freshwater loch before flowing northeast to the A939?

Context paragraphs:
Linlithgow Loch: Linlithgow Loch lies immediately north of the town of Linlithgow in West Lothian, Scotland.  1.3 kilometres in length and 0.4 in breadth, its area of 41 hectares makes it the largest natural freshwater loch in Lothian.  It is, however, shallow, with a mean depth of 2.3 metres and a maximum depth of 9.2 metres.  The loch is fed by four small streams, the Hatchery Burn, the Bonnytoun Burn, the Springfield Burn, and Bell's Burn, and drained by the Mill Burn on its western side, which eventually joins the Avon.

Loch Ericht: Loch Ericht (Scottish Gaelic, "Loch Eireachd") is a freshwater loch on the border between Perth and Kinross and the Highlands Council areas of Scotland.  It is situated at a height of 351 metres above sea level and has a north-east to south-west orientation.  The village of Dalwhinnie lies at the north east end of the loch.  The loch is 14.5 mi in length and has a surface area of approximately 7 square miles.  Loch Ericht is the tenth largest freshwater lake in Scotland and has a good reputation for its trout fishing.

Chienti: The Chienti is a river in the Marche region of Italy.  Its source is near Serravalle di Chienti in the Appennino Umbro-Marchigiano mountains in the province of Macerata.  The river flows northeast through the mountains past Muccia and enters and exits a small reservoir before entering Lago di Pievefavera.  After exiting Lago di Pievefavera, the river continues flowing northeast before being joined by the Fiastrone at Belforte del Chienti.  The river continues flowing northeast past Tolentino before being joined by the Fiastra south of Macerata.  The river flows east near Corridonia and forms the border between the province of Macerata and the province of Fermo before flowing into the Adriatic Sea near Civitanova Marche.

Dorback Burn, Findhorn: The Dorback Burn (Scottish Gaelic: "Dorbag / Uisge Dhorbaig" ) is a right-bank tributary of the River Findhorn in northeast Scotland.  It emerges from the northeast end of Lochindorb ( ) and flows northeast to a point where the A939 road and A940 road meet, where it is joined on its right by the Anaboard Burn.  The Dorback then flows north, accompanied by the A940 for several miles until it is joined by the River Divie, which also enters from the right (east).  Their combined waters flow on for a couple more miles to pass under the B9007 road and immediately enter the Findhorn ( ).

Loch Scaven: Loch Scaven (Gaelic: Loch Sgamhain) is a small freshwater loch at the head of Glen Carron near the source of the River Carron, Wester Ross, Scotland.  It is about 4 mi southwest of Achnasheen and 2 mi from Loch Gowan.  The loch tends in a northeast to southwest direction and its shore is relatively simple.  At the west end there is a significant promontory known as 'Cnoc nan Sguad' which projects into the loch on the northern shore.  There are two small islands in the centre of the loch opposite Cnoc nan Sguad.

Loch Laggan: Loch Laggan is a freshwater loch situated approximately 6.5 mi to the west of Dalwhinnie in the Scottish Highlands.  The loch has an irregular shape, runs nearly northeast to southwest and is approximately 7 mi in length.  It has an average depth of 68 ft and is 174 ft at its deepest.  The eastern end of the loch features the largest freshwater beach in Britain.  Since 1934 Loch Laggan has been a reservoir, retained behind the Laggan Dam, forming part of the Lochaber hydro-electric scheme.  At the northeast end of the loch is the hamlet of Kinloch Laggan.

Loch Oich: Loch Oich ( ; Scottish Gaelic: "Loch Omhaich" ) is a freshwater loch in the Highlands of Scotland which forms part of the Caledonian Canal, of which it is the highest point.  This narrow loch lies between Loch Ness (to the Northeast) and Loch Lochy (to the Southwest) in the Great Glen.  It is fed by the River Garry (from Loch Garry) from the West, and feeds the River Oich from its North end.  The Laggan locks separate it from Loch Lochy.

Loch Duntelchaig: Loch Duntelchaig (from the Scottish Gaelic Loch Dun Seilcheig) is a freshwater loch in the traditional county of Inverness-shire in the Scottish Highlands.  It extends 5 km from the southwest to its outflow in the northeast and measures up to 1.75 km at its widest.  The loch drains via Loch a Chlachain into the River Nairn.  Loch Duntelchaig is over 60m deep towards its south end.  It is also the main reservoir for Inverness sitting less than a kilometre from the secondary reservoir Loch Ashie.

Loch Voil: Loch Voil (Scottish Gaelic: "Loch a' Bheothail" ) is a small freshwater loch in Scotland.  It is a short, narrow loch approximately 5 km (3½ miles) in length.  It is separated from Loch Doine by fluvial deposits from the Monachyle Burn and is drained at its eastern end by the River Balvag at Balquhidder.  The Loch can be reached by a small single track road from Balquhidder leading to Inverlochlarig.

Lochindorb: Lochindorb (from the Scottish Gaelic: "Loch nan Doirb" meaning "loch of the minnows") is a freshwater loch north of Grantown on Spey in the Highland council area of Scotland.  This loch is home to the ruins of Lochindorb Castle, a former stronghold of the Clan Comyn and is built on what now is said to be an artificially created island.  It is also a popular spot with fishers and birdwatchers, the latter of whom come to see the local black-throated divers and greylag geese.  At the southeast edge of the loch there is a small patch of coniferous forest.

Supporting paragraphs: Dorback Burn, Findhorn Lochindorb
Answer: Lochindorb